The Original Bitcoin Client is free, open-source software. The current version is 0.8.5, you're free to download it here:
Window Mac Linux
Window Setup (9.2MB) Mac Installer (12.0MB) Code & Binaries (11mb)
Download Here Download Here Download Here
After downloading, simply install the client on your Windows, Mac or Linux computer. It will automatically create a wallet for you and start downloading the transaction history. (Future versions will have a "lightweight" mode where this is not necessary.)
Another way to get a wallet is to get one online at Coinbase or MyWallet. With this option you don't have to install anything, but you have to take great care not to lose your password and you're trusting that site to keep your wallet safe.
Once your wallet is set up, you'll get your first Bitcoin address, which means you're ready to receive Bitcoins!
Step 2 - Get Bitcoins
Not the most convenient way, but bonus programs offer small amounts of Bitcoins when making other purchases, for completing surveys etc.
Medium amount of coins
- See if there are local Bitcoiners in your area at LocalBitcoins.com and TradeBitcoin.com!
Physical Bitcoins are available through Casascius and BitBills. Those places only accept Bitcoin, but you can get them with a credit card through MemoryDealers. You do pay a markup for the production and delivery, but it's a fairly easy way to get moderate amounts of coins. Plus the physical coins make a great and memorable gift!
Large amount of coins
For larger purchases there are several currency exchanges, such as Mt. Gox, Bitstamp, CampBX, Intersango and Virtex (CA).
Fund your exchange accounts or buy Bitcoin directly at one of over 700 000 locations worldwide via BitInstant.
If you prefer skipping the exchange and dealing directly with other people you can head over to Bitcoin OTC.
What to do with my Bitcoins?
You can find lots of Bitcoin-related services on the Trade page in the Bitcoin Wiki.
Check out Bitcoin's largest online auction house at BitMit!
An increasing number of physical stores, restaurants and other venues accept Bitcoin as well. Check Bitcoin Travel and Bitcoin Navigator to see if there are any in your area.
Turn your Bitcoins into gift cards from Amazon, Barnes & Noble, iTunes and many more at SpendBitcoins.com. Or get gift codes for services like XBoxLive, PSN or iTunes instantly online at Bitcoincodes.com.
Buy music, ebooks, wallpapers and other downloadable content at CoinDL!
You might also want to check the Bitcoin Marketplace forum on Bitcoin.org.
Over-the-counter trading is being done via IRC chat in Bitcoin OTC (#bitcoin-otc on Freenode).
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